HDR (High Dynamic Range) makes bright areas of the screen look even brighter, allows the TV to display new colors and significantly expands the range of the contrast ratio on-screen. HDR+ enhances High Dynamic Range (HDR) quality to its highest picture quality capacity, even if the source isn’t in HDR format. HDR+ also uncovers previously hidden images from darker content scenes, supplementing the level of brightness to express objects hidden in darker shadows. For brighter content scenes, HDR+ increases the level of contrast ratio to differentiate objects from the background, while still depicting more image details on the screen for an overall better picture

HDR+ on your TV is a faux HDR effect mate, It attempts to map the current source into the native range of the panel. Invariably this leads to an unatural oversaturation of colours, also the extra brightness increases the likleyhood of other issues such as haloing.

The only way it would add extra detail to the scene would be because the TV was poorly calibrated in SDR mode.